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This species is accepted, and its native range is NW. U.S.A. to California.
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Perennial; caespitose; clumped densely. Rhizomes absent, or short. Culms 40-80 cm long. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 1.5-3.5 mm long; pubescent on abaxial surface; erose, or lacerate; truncate, or obtuse. Collar glabrous. Leaf-blades flat, or involute; 2-4 mm wide. Leaf-blade surface scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Peduncle smooth, or scaberulous above. Panicle contracted; linear; 7-12 cm long; 1-1.5 cm wide. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.24-0.5 length of lemma.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.24-0.5 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5-6 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1-3 -veined. Upper glume primary vein scaberulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 4-5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins distinct. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 5-6 mm long overall; not or scarcely exserted from spikelet; with twisted column. Palea 1 length of lemma. Rhachilla extension 1.2 mm long; 0.25 length of fertile floret; pilose; with 1 mm long hairs.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.6 mm long. Anthers 3; 2.2-3.2 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
Distribution
North America: northwest USA, southwest USA, and Mexico.
Reference
Aveneae. Fl Pac NW 1994.

Native to:

California, Idaho, Montana, Oregon, Washington, Wyoming

Calamagrostis koelerioides Vasey appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Orcutt, C.R. [s.n.], California Calamagrostis densa K000838368

First published in Bot. Gaz. 16: 147 (1891)

Accepted by

  • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

Literature

Kew Backbone Distributions

  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

GrassBase - The Online World Grass Flora
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0